It is a device capturing and controling all the signals, which are being created by the whole system, especially the made and received phone call signals. The device is mostly used for connecting regular phone system with the Internet and backwards.
BD WHITE : 800 Minit 2100BDT
BD GREY : 1300 Minit 2100
INDIA : 2000 Minit 2100BDT
PAK : 710 Minit 2100BDT